Blasting Cabinet Metering Valve

How big is the black hose going to the gun? I think mine is at least 1/2". That pipe nipple the hose is clamped to is a restriction too. I went with the thinnest brass nipple I could find.
I don't think the feed will compensate for a crappy gun, but it should provide a more consistent supply of media. Mine went from cutting out all the time to a nice consistent flow. I'll try to snap a pic this afternoon.